Buggy code:
public class TestUtils { private TestUtils ( ) { } public static void assertEquals ( double expected , double actual , double delta ) { } public static void assertEquals ( String msg , double expected , double actual , double delta ) { } public static void assertSame ( double expected , double actual ) { } public static void assertSame ( Complex expected , Complex actual ) { } public static void assertEquals ( Complex expected , Complex actual , double delta ) { } public static void assertEquals ( double [ ] expected , double [ ] observed , double tolerance ) { } public static Object serializeAndRecover ( Object o ) { } public static void checkSerializedEquality ( Object object ) { } public static void assertRelativelyEquals ( double expected , double actual , double relativeError ) { } public static void assertRelativelyEquals ( String msg , double expected , double actual , double relativeError ) { } public static void assertContains ( String msg , Complex [ ] values , Complex z , double epsilon ) { int i = 0 ; boolean found = false ; while ( ( ! found ) && ( i < ( values . length ) ) ) { try { TestUtils . assertEquals ( values [ i ] , z , epsilon ) ; found = true ; } catch ( AssertionFailedError er ) { } i ++ ; } if ( ! found ) { <START_BUG> Assert . fail ( ( ( msg + "<seq2seq4repair_space>Unable<seq2seq4repair_space>to<seq2seq4repair_space>find<seq2seq4repair_space>" ) + ( ComplexFormat . formatComplex ( z ) ) ) ) ; <END_BUG> } } public static void assertContains ( Complex [ ] values , Complex z , double epsilon ) { } public static void assertContains ( String msg , double [ ] values , double x , double epsilon ) { } public static void assertContains ( double [ ] values , double x , double epsilon ) { } public static void assertEquals ( String msg , RealMatrix expected , RealMatrix observed , double tolerance ) { } public static void assertEquals ( FieldMatrix < ? extends FieldElement < ? > > expected , FieldMatrix < ? extends FieldElement < ? > > observed ) { } public static void assertEquals ( String msg , double [ ] expected , double [ ] observed , double tolerance ) { } public static < T extends FieldElement < T > > void assertEquals ( T [ ] m , T [ ] n ) { } public static double sumSquareDev ( double [ ] values , double target ) { } public static void assertChiSquareAccept ( String [ ] valueLabels , double [ ] expected , long [ ] observed , double alpha ) throws Exception { } public static void assertChiSquareAccept ( int [ ] values , double [ ] expected , long [ ] observed , double alpha ) throws Exception { } public static void assertChiSquareAccept ( double [ ] values , double [ ] expected , long [ ] observed , double alpha ) throws Exception { } public static void assertChiSquareAccept ( double [ ] expected , long [ ] observed , double alpha ) throws Exception { } public static double [ ] getDistributionQuartiles ( ContinuousDistribution distribution ) throws Exception { } public static void updateCounts ( double value , long [ ] counts , double [ ] quartiles ) { } public static int eliminateZeroMassPoints ( int [ ] densityPoints , double [ ] densityValues ) { } }

Fix:
Assert . fail ( ( ( msg + "<seq2seq4repair_space>Unable<seq2seq4repair_space>to<seq2seq4repair_space>find<seq2seq4repair_space>" ) + ( new ComplexFormat ( ) . format ( z ) ) ) ) ;